Spare Tire with 285s

Do you mean 285/75/16?

 

So to be safe.... If I'm running 285/70/17s should I buy a cheap spare tire on the spare rim that is 285/75/16? Will it rub in the front if I have to use it?

 

i dont even know anymore, people saying the width is the height and backwards is sideways and down is up...im all off now.

just make sure the last two numbers are the same as the tires that are on your truck now.

http://www.tirerack.com/tires/TireSearchResults.jsp?width=275%2F&ratio=70&diameter=16&x=36&y=9

get a 70, that will be the same height as the tires you have now and keep everything in check.
no sense if getting it as wide as a 285, that'll just cost you more money

 

Actually the 265/75/16 is the closest size (besides the 285/75/16). It's only like 3% difference in diameter than the 285/70/17.

Will a 265/75/16 rub more or less than a 285/75/16 on the spare rim?

 

285 is wider and will rub more and hang down lower under your truck, thats why i was saying get the 265 or 275, cause its narrower

 

I ran 285/75/16's on stock rims with rubbing at full lock on the UCA. I did it for about 15k miles, so it rubs but not bad enough to destroy the tire, atleast in my case.

I ran a 265/75/16 on a stock rim after getting a flat on the front right and ran it with no rubbing(150 miles of driving). It is definately a narrower tire, but the overall height was pretty close to my nearly spent 285/75/16's

Long story short, I had no rubbing with a 265/75/16 and minimal(only at full lock) rubbing with a 285/75/16 on a stock trd or rim.

 

So a 265/75/16 wont work as good as a 275/70/16? The 265/75/17 is closer to the 285/70/17 in diameter but it's not a 70 as you say I had better get.

Thanks!

 

flip a coin and call it a day

 

Or get the cheapest thing I can find in both sizes....looks like it's the
Kumho Road Venture AT KL78
265/75/16

http://www.tirerack.com/tires/TireSearchResults.jsp?filtering=true&width=265/&ratio=75&diameter=16

http://www.tirerack.com/tires/TireSearchResults.jsp?width=275%2F&ratio=70&diameter=16&x=26&y=6

 

^ yeah. For what it's worth, I have a 285/70/17 ATZ on a pro comp steel rim in my spare location. It was a tight fit, but now i have the same tire size and backspacing all around. I've read somewhere on here that running different size tires on 09's and up with our LSD's could burn up the brakes

 

your right. different sizes on the rear end of a truck with LSD could be bad.
And I agree with the confusing part too...

 

Just reread this thread cuzz I'm bout to order my wheels and tires. I think I'm more confused now than I was before I read it.

 

I have roadside assistance. Tow my ass home!
The furthest I think I would have to drive on my stock spare is MAYBE 75 miles if I was on a trail (and by trail I mean ROUGH dirt road....I don't really wheel my truck that hard...that's why I have the ATV!) and get back home.

But like said earlier.....I've seen cars drive up and down the highway at highway speeds with a donut for weeks.

I think it's just a choice, driving habits, etc.

 

Actually the 285 does have something to do with the height. Yes, technically it is the WIDTH of the tire, but if you look at any good tire guide, and compare for example a 285/75 vs. a 275/75, you will find that the tire diameter does indeed go up. Because all of these things play together. I.E. the width with the aspect ratio, etc. I know this because my BFG Goodrich All Terrain TA KO's are 285/75R16 and are like 32.8' (almost 33's basically), whereas if I had went with the 275/75R16 they would have been closer to 32's. Just pull up tirerack or BF GOODRIDGE and look at any of the details dimensional charts and it'll show you how these calculations work out.

 

ABSOLUTELY. If you are running a smaller tire, say a 31' when the rest of your tires are 33' and you're in the backcountry 4x4ing. YOU DO NOT want that smaller spare on the bag tires, or you CANNOT use your lockers, and probably will not be good for LSD. It will mean swapping around tires so that the smaller spare is on the front.

 

Agreed, I just purchased my 2010 Taco Off-Road, it has a moderate (level lift kit) and 285/75R16's installed on stock rims (NO OFFSETS or spacers - bad idea)...and there is minimal rubbing on the upper control arm. It doesn't seem to be a problem at all, and I prefer this to tires sticking out. I've been told it won't hurt the UCA and I doubt it's doing much to the tires, it has to be full lock, at which point I would be going very very slow.

 

Does anyone have 285/75 (33's) currently mounted under their truck (spare spot?) I see someone did some 285/70's in the beginning of this post by grinding down the frame tabs. I'm wondering if it would work or be an issue getting a full sized spare 285/75 under mine. That is still an unresolved issue and given the other "potential concerns" listed above, I would rather not run on a 31' (vs. my full size 33's) in the back country if something happens.

 

Just buy a tire that has as close to the same outside diameter as the other ones that fits whatever size rim you have for a spare and call it a day. As long as the tire is the same outside diameter and the rim has same lug pattern LSD and brakes should be happy. Unless you have 15" wide tires and a 6" wide spare not seeing how it'd matter that microscopically. If it somehow does, then get 5th rim and same tire for spare.

 

Fellas, if you want to calculate the height (outer diameter) of your tires, do this:

Consider a 265/75/16 Tire. The tread width is 265 mm, aspect ratio of sidewall height to width is 0.75 (that's the 75), and the rim diameter is 16 inches. Bear in mind that 1 inch is 25.4 mm.

To calculate the tire OD, or height in inches:

265 mm x 0.75 = 198.75 mm this is your sidewall height

Rim diameter is 16", therefore radius is 8 inches. To convert to millimeters, 8 inches x 25.4 mm/inch = 203.2 mm

Add these two together to get the tire radius: 203.2 mm + 198.75 mm = 401.95 mm.

Multiply this by 2 to get the tire's outer diameter (which is the tire height) in millimeters: 401.95 mm x 2 = 803.9 mm

Divide this by 25.4 mm/inch to covert to inches: 803.9 mm / 25.4 mm per inch = 31.6 inches

Do this for a 265/70/17 tire, and you'll wind up with a height of 802.8 mm, which is also 31.6 inches

Follow these same formulae, and you can find which sizes of spare tires will match whatever tires you're running.

 

I ended up getting a used 265/75/16. It's a little smaller tire but only by an inch. I doubt 1" difference would be bad for the LSD.